A method for controlling the system pressure of a centrifugal air compressor station

Abstract

The invention discloses a control method and a control system for the system pressure of a centrifugal air compression station, and relates to centrifugal air compression station output system pressure control and load compensation control of each compressor unit in the air compression station. The control system comprises a centralized control system, wherein the centralized control system and acompressor unit field programmable logic controller (PLC) control station are in double-way connection; the centralized control system comprises a system pressure change compensation module, a load compensation module and a power limit control module; a remote pressure setting instruction is that Pds is equal to PS+PC+PL; a remote pressure setting instruction Pds input field PLC control station isused as a setting point; whether each compressor exceeds the limit or not is judged according to preset limiting power value of power of each compressor unit in the air compression station; and if the compressors exceed the limit, an inlet guide vane and an exhaust valve of each compressor unit are controlled through the field PLC control station, so that each compressor unit is ensured to outputan appropriate load. The control method and the control system for the system pressure of the centrifugal air compression station provided by the invention solve the technical problems how to controlthe pressure of a user air supply system to be stable, enable each compressor unit in the air compression station to bear the appropriate load, and reduce the energy consumption.

Description

technical field [0001] The invention relates to the field of centralized management and control of a centrifugal air compressor station, in particular to a method for controlling system pressure of a centrifugal air compressor station. Background technique [0002] As one of the four fluid media (water, compressed air, steam and natural gas) used in industrial production, compressed air is widely used because of its safety, cleanliness and ease of control, and plays a pivotal role in industrial production. At present, large-scale factories and industrial parks have established air compressor stations for centralized air supply. Each air compressor station generally consists of several or even more than a dozen air compressors. The types of air compressors used are mainly screw air compressors. And centrifugal air compressors, among which centrifugal air compressors are more and more widely used in air compressor stations due to their high efficiency and large capacity. [0...

AI Technical Summary

Problems solved by technology

[0007] The above control methods are still based on independent automatic adjustment of a single air compressor and remote or on-site manual intervention. For multiple air compressors running at the same time, the air compressor with a strong effect will cause the air compressor with a weak effect to surge first. limit, resulting in unnecessary waste of air release, and under the working conditions where the user's demand for compressed air volume fluctuates greatly, the independent adjustment of the single machine and manual intervention often do not respond in time, resulting in large fluctuations in the pressure of the external system of the air compressor station

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